Wireless-telegraph installation for aerial vessels.



L. ROUZET. WIRELESS TELEGRAPH INSTALLATION FOB. AERIAL VESSELS.

APPLICATION nun APR. 21, 1913.

1,106,729.- Patented Aug. 11, 191

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LUCIEN ROUZET, OF PARIS, FRANCE.

WIRELESS-TELEGRAPH INSTALLATION FOR AERIAL VESSE-LS.

Specification of Letters Patent.

Application filed April 21, 1913. Serial No. 762,723.

To all whom it may concern:

Be it known that I, LUCIEN Boozer, a citizen of the French Republic,residing at 30 Rue Beaunier, Paris, France, have invented certain newand useful Improvements in \Vireless-Telegraph Installations for AerialVessels; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

In fitting up a wireless telegraphy station upon an aeroplane it is ofgreat importance that in operation there shall be absolute protectionfrom the possibility of the aviators receiving a fatal or other electricshock. The pilot in particular must not be exposed to the fear ofaccident through coming into contact with the installation. In fittingup a station on the aeroplane with floating antenna, that is a wirehanging beneath the aeroplane, all the fixed parts of the installationcan be perfectly insulated. The winch, however, for rolling up andunrolling the antenna presents greater difiiculty in the matter ofperfect insulation, and it must be borne in mind that the winch is thepart of the apparatus which has to be most often manipulated.

The present invention relates to a general arrangement of theinstallation by which a tension node is obtained at the starting pointof the antenna, that is to say at the winch upon which it is rolled. Inthis way the insulating of this portion becomes very imple and thedangers of sparks or'electrification through contact with this part arepractically eliminated. 1

Figure 1 of the accompanying drawin shows an example of this arrangementant Fig. 2 is a diagram of the samearrangement.

Fig. 1 shows an aeroplane F which is provided with a wirelessinstallation constructed according to the present invention.

A is the flying antenna,\vhich is rolled up and unrolled by means of thewinch B on the framework N of the aeroplane, i. e. within reach of theaviator operating the device. This winch is connected by a very shortconnectin device cd, to the coupling device 0 the ot er extremity f ofwhich is connected with one or more wires G stretched upon the aeroplaneand forming a small metallic network, which is so proportioned as toequilibrate the antenna with respect to the electric oscillationsandtherefore constitutes a counterpoise. The metallic network forming thiscounterpoise is very carefully insulated at all points of attachment 2'so as to avoid any contact or production of sparks from the wires G ofsuch network. The insulation at the points of attachment 2' may beeffected in any suitable manner, for instance by means of ebonite rodsofs'utficie'ntlength to insure such insulation. Each of the rods isattached at one extremity to 'the framework ofthe aeroplane while thewires G are attached at the other extremities of the rods. The wires ofthe counterpoise may be constituted by a single wire, by two or morewires in parallel or by cables a follows from general considerations inconnection with the construction of antennae for wireless telegraphicapparatus.

The invention is further characterized by the following arrangementz-Theapparatus for producing the oscillations, T, is con- .nected to acoupling device 0 in'such a way as to excite or energize thecounterpoise G. The transmitting apparatus T, can be of any systemwhatever for producing highfrequency; it can for example comprise analternator M driven by the aeroplane motor, a key 12, a transformator U,a condenser R and aspark-ga E. A transmitting device comprising theaforesaid elements is shown schematically in Fig. 2. For the sake ofclearness the details of the transmitter T are not shown in Fig. 1 inwhich only the connections of said transmitter T to the points cl and eof the coupling device 0 are indicated. The antenna A is connected tothe lower part of the coupling device at the point I that is to say atthe point where with ordinary fixed installations the earth isconnected. The supplementary convolutions of the device 0 (that is thosebetween @f) are so chosen as, with the counterpoise G,

Patented Aug. 11, 1914.

wires of the counterpoise are characterized by an arrangement so thatthe induction in the parts of the aeroplane is a minimum. With thisobject in view they may be arranged in various ways according to thelength of the antenna. For instance, for a short antenna, thearrangement is such as shown at Fig. 1; one or more wires f--p-lz. andfg-lc with or without a connecting wire lL-lfl. For a long antenna, thecounterpoise'fwith the connecting wire it7c may be in sections Z, m and11, these points being then insulated as at 2'. In these cases thelength of the wire is greater than and in electrical discord with thelengtlroif the stretchers of the metallic portions of the aeroplane.

What I claim and desire to secure by Letters'Patentof the-United Statesof America is. 1

1. In a wireless telegraph installation for an aerial vessel, anelectrical counterpoise insulated from the framework of the aerialvessel, a flying antenna carried by'a winch on 'such,vessel, a couplingdevice in connection with a source of electrical oscillations and withthe counterpoise and a short connection between the winch and thecoupling "device, the antenna being con- I nected at the point wherewith an ordinary fixed station the earth is connected and thesupplementary convolutions of the coupllng device that is those betweenthe point of connection of the oscillation producing de-v vice and thecounter-poise being so chosen that, with the counter-poise; theyequilibrate the system in such a way as to produce a tension node at'thepoint of departure of the flying antenna.

2. In a wireless telegraph installation for an aerial vessel, acounterpoise formed of a network of metallic wires these wires being ofsuch length that the period of oscillation of the system is differentfrom the proper period of oscillation of the metallic parts of theaeroplane so as to avoid induction -in such parts, a winch mounted onthe aeroplane and carrying aflying antenna, a coupling device mounted inconnection with the source of oscillations and with the counterpoise,.and. a short connection between the winch and the coupling device, theantenna being connected at the point where with an ordinary fixedstation the earth is connected and the supplementary convolutions of thecouplingdevice, that isthose between the point of connection of theoscillation producing device and the counterpoise being so chosen thatwith the counterpoise they equilibrate the system in such a way as toproduce a tension node at the point of departure of the flying antenna.

3. In a wireless telegraph installation for an aerial vessel, anelectrical counterpoise consisting of a network of wires insulated atall points of attachment to the framework of the aerial vessel by meansof ebonite rods of suflicient length to insure such insulation,

each of the rods being attached at one extremity to the framework of thevessel and .the wires ofthe network being attached atthe otherextremities of such rods,a ying antenna carried by such vessel andconnected at the point where with an ordinary fixed station the earth isconnected, a coupling device in connection with a source of electricaloscillations and with the network forming the ccunterpoise and a shortconnection between the flying antenna and the coupling 'dcviceall forthe purposes set forth.

In testimony whereof, I afiix my signature, in presence of twowitnesses.

' LUCIEN R-OUZET. Vitnesses Hanson C. Coxn. FRED. BARLOW. Y

